The latest round of talks was held to hammer out a final agreement on Iran's nuclear energy program.

The discussions were the first round of high-level negotiations between Tehran and the six world powers after the two sides arrived at a landmark interim deal in the Swiss city of Geneva on November 24, 2013.

Under the deal, the six countries undertook to provide Iran with some sanctions relief in exchange for Iran agreeing to limit certain aspects of its nuclear activities during a six-month period. It was also agreed that no nuclear-related sanctions will be imposed on Iran within the same timeframe.

The agreement, dubbed the Geneva Joint Plan of Action, went into effect on January 20.